The passage seems to indicate that we are able to get the [E]T from the plot, is that even possible?
The question related to this graph was a M1V1=M2V2 problem to get [E]T. So I am guessing no?
A Lineweaver-Burke plot shows the rate data for various substrate concentrations at a specific and given [E]total. Therefore, you can't determine the [E]total just from looking at the graph and usually, the [E]total at which the experiment is performed will be specified in the figure legend (when you're reading a paper).